SciFinder Scholar (Chemical Abstracts) is on University Workstations in the Physical Sciences and Engineering Libraries. It is also located on the Databases by Title list under SciFinder Scholar. You must have the appropriate software to use this database.
Compendex - indexes journals and conferences in all areas of engineering.
Beilstein and Gmelin handbooks cover organic chemistry and inorganic/organometallic chemistry from the late 1700s. You need to download software for these handbooks. The link takes you to a page with the appropriate information.